Vox tube swap question

[68_Custom Shop]

I swapped out the stock tubes(electro-harm.) for a matched quad of JJ/Tesla.Replaced the pre-amps too,and better speakers.Do I need to re-bias the amp? Or,is this a plug-n-play?I've been playing this thing for two weeks and it seems fine to me.These are supposed to be great replacements for this amp,but I know nothing about the electronic side to these baby's! Is everything good or am I a idiot about to blow up an expensive amp?
Vox AC30CC 2x12

[moo cow]

yes! rebias. will it destroy you amp if you don't? probably not.
but if the bias is cold it won't give you that nice warm tube sound you paid for. if it's too hot it will burn out your tubes fast and you'll be buying new tubes soon.

[Timbre Wolf]

And in complete, 180 degree opposition to the previous post, I will say don't try to re-bias, as this is a cathode-biased amp, and you'd have a hell of a time finding the bias adjustment pot. The previous poster has probably only been familiar with fixed/adjustable-bias amps, such as most classic blackface Fenders.

Just plug 'em in and enjoy yourself (after replacing all those screws you removed, you deserve this).

- Thom

[CPA]

if you really want to amp to shine

look for some russian military tubes from the late 80"s